F-350PB1 is a self-contained, push button buzzer system that includes a 4-inch high output buzzer pre-wired with 100ft of 2-conductor cable to our 2121B-P push button controller that is suitable for mounting outdoors. This system is great for warehouses, shipping areas, etc. Simply mount the buzzer, plug it in and depress the push button for the desired amount of time the buzzer needs to sound. Included 24VAC plug-in power module that fits any standard 120VAC outlet.